Troelstra's Paradox and Markov's Principle
Résumé
A prominent problem for the Theory of the Creating Subject is
Troelstra's Paradox. As is well known, the construction of that
paradox depends on the acceptability of a certain impredicativity, of
a kind that some intuitionists accept and others do not. After a
presentation of the Theory of the Creating Subject and the paradox, I
argue that the paradox moreover depends on Markov's Principle, in a
form that no intuitionist should accept. A postscript discusses a new
version of the paradox that Troelstra has proposed in reaction to my
argument.
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